Printing device for weighing machines



June 1, 1943. N 2,320,592

PRINTING DEVICE FOR WEIGHING MACHINES Filed June 2, 1939 Fig.2

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Inventor: v MP/MK/ man/r Patented June I, 1943 UNITED PRINTING DEVICE FOR WEIGHING MACHINES Arthur Hahn, Balingcn, Germany; vested in the Alien Property Custodian Application June 2, 1939, Serial No. 277,074 In Germany May 20, 1938 8 Claims.

The invention relates to a printing device for weighing machines having one or more carrier members or discs provided with weight value devices to be explored, mounted on the pointer shaft and moved by the rotation thereof, against which disc or discs one or more feeler equipments serving for the adjustment of type carriers are caused to strike.

In known printing devices of this kind the feelers adjusting the type carriers cooperate directly with the devices of the control discs located on the pointer shaft. Since the feelers in these known devices are applied with great pressure to the control discs, these discs and the pointer shaft carrying them must be strongly constructed if they are not to be damaged by this applied pressure. This necessity of providing strong construction of these part provides greater weight in the parts than is desired and impairs the accuracy of the weighing machine.

This disadvantage is removed in the present invention wherein the feelers exploring the control discs situated on the pointer shaft are so arranged in cooperative relation with the additional feelers which serve to adjust the type carriers that their plane of movement is perpendicular to the plane in which the said additional feelers move.

By the construction in accordance with the invention it is possible to reduce the weight of the control discs to a minimum value and thereby to increase the accuracy of the weighing machine.

In the case of the known previously mentioned direct exploration of the control discs by the feelers adapted for adjusting the type carriers, the devices to be explored must have a size determined on the driving means of the printing device, and in order to be able to locate these devices on the control discs, considerable size of the discs is necessary. According to the present invention the control discs and their devices to be explored are so constructed and cooperatively arranged that they can be made relatively small, and between these devices and the devices to be explored by the feelers adapted for adjusting the type carriers there is effected a reduction in magnitude of the exploring movement to be carried out at the control discs.

The devices to be explored by the additional feelers which serve to adjust the type carriers and the feelers for the exploration of the devices of the control discs preferably are mounted on different arms of double-armed, nearly balanced explorable levers. During the exploration of the control discs the feelers are applied to the devices to be explored with slight pressure and simultaneously carry out a corresponding displacement of the devices which are to be explored by the additional feelers which serve to adjust the type carriers.

The reduction of the magnitude of movement of the feelers exploring the devices of the control discs preferably is effected by an advantageous lever length arrangement. Preferably a doublearmed lever cooperates at its shorter end with the control discs, and at its longer end with the additional feelers associated with the type carriers. Upon radial exploration of the control discs, the exploration of the devices associated with the additional feelers associated with the type wheels occurs in axial direction.

A further feature of the invention resides in so mounting the explorable levers that they slide in fixed guides which are mounted in the direct vicinity of the explorable devices on said levers and take up the pressure of the additional feelers during the exploring operation.

Another object of the invention is to provide a structure in which the additional feelers exploring the explorable devices of the control discs are according to the invention normally held locked in readiness for exploring, a device being provided which simultaneously or nearly simultaneously with the release of thi look releases the feelers adapted for adjusting the type carriers, which feelers are likewise held in readiness for exploring.

In the case of a weighing machine having a plurality of control discs it is desirable to arrange the devices to be explored by the feelers adjusting the type carriers in one plane.

A weighing machine according to the invention i illustrated in the drawing in an embodiment by way of example.

Figure 1 is a vertical cross sectional view, essential parts of the weighing machine structure being shown in front view, and the additional feel.- ers being shown in vertical cross section.

Figure 2 is a corresponding plan view.

On the pointer axle l of a measuring head 2 of a Weighing machine is firmly mounted the pinion 3, to which the movement of the lever mechanism of ony desired weighing system is transmitted by the rack 4. There are likewise firmly mounted on the pointer axle l carrier means in the form of control discs 5 (units), 6 (tens) and l withprojection 8 (hundreds and thousands). The control disc 6 is, for the purpose of Weight reduction, provided with openings. The control discs 5 and l are fixed with respect to the disc 6 and may be secured thereto and each may have the form of an annulus and is constructed in known manner with step-like recesses according to the weight values. The disc carries the step-like recesses for the 1 kg. values 9, the disc 6 the recesses for the kg. values I0 and the disc I recesses for 100 kg. values II. .On the disc I is laterally mounted a raised part 8, which for example in the case of a 1000 kg. weighing machine controls the 100 kg. exploring segment after the weight value 999 kg.

The control discs serve only for the adjustment of explorable levers and are not subjected to the load by the weight feelers which adjust the type carriers 29. Said discs are small in circumference and in thickness and consist of a very light material, and thus practically no adverse influence is exerted on the weighing system.

In the printing operation, the driving shaft I2 is moved in the direction of the arrow (Figure 2), and the rack I3 is displaced in the direction A by the gear Wheel I4. The projection I5 moving with the rack I3 rocks the angle lever I6 and thus permits the explorable levers II (units), I8 (tens), I9 (hundreds) and (thousands) to swing downwardly as Viewed in Figure l. The

segments were previously held locked in the position of Figure 1 with the feeling pins 2| out of contact with the discs by the arm IBa of the lever I6 which was in engagement with the projection I5 before operating movement of the shaft I2. --The exploring segments are nearly balanced and fall. downwards as viewed in Figure 1 and adjust themselves to the weight values in accordance with the stop which the initial feelers in the form of feeling pins 2I on the control discs meet. The

guide 22 has depending portions close to the explorable levers I1, I8, I9, 20 and thus prevents a .bending of said explorable levers. verse rail 23 on the rack I3 at the same time re- The transleases the additional feelers 24 (units), 25 (tens), 26 (hundreds) and 21 (thousands), which in accordance with the stop which they meet on the explorable levers adjust the type wheels 29 by means of racks 28, from which type wheels the the explorable devices at the ends thereof are disposed ina single exploring plane. Thus, theadditional feelers 24, 25, 26, 21 may be made of the same length.

After the printing operation. the driving shaft "I2 is rotated back to its starting position. The

rack I3 is moved in the direction B and moves all jofj the feelers 24, 25, 26 and 21 through engagement of the pins 23a projecting therefrom with the transverse rail 23. Movement of the lever I6 and I6a by reason: of engagement of the projection I5 therewith serves to move all the exploring segments II, I8, I9 and 2|] back into their nonactive position. In this position the explorable levers and the feelers of the printing device are held locked until the next printing. See Figure 1.

It is to be clearly understood that various ,changes in the detailsof construction and ar- "ra'ngement of parts may be made without departing from the scope of the invention as set forth in the appended claims.

I claim: 1. Printing mechanism for a weighing machine which includes a rotatable pointer shaft, o prising at least one disc mounted on the pointer shaft and having weight valve devices adapted to be explored, double arm levers each having an initial feeler on one arm thereof for exploring and lightly contacting the said value devices on said disc, means providing explorable devices on the other arm of each said levers, means providing a fixed guide within which said levers are movable with the guide serving to prevent bending of said levers, and additional feelers cooperating with the said explorable devices for adjusting and setting the printing mechanism, said additional feelers being movable at right angles to the planes of movement of the levers carrying said initial feelers whereby to permit exploring of the said explorable devices with substantially no increase in the force applied to the weight value devices on said disc.

2. Printing mechanism for a weighing machine which includes a rotatable pointer shaft, com-prising a disc and a plurality of light and relatively fragile annuli mounted on the pointer shaft and having weight value devices adapted to be explored, a plurality of levers mounted for pivotal movement in parallel planes and having initial feelers at one end thereof for exploring the corresponding weight value devices, means providing explorable devices adjacentthe opp0- site ends of said levers, guide means cooperating with the said levers to resist bending thereof out of their normal planes, and additional feelers cooperating with the explorable devices on said levers for adjusting and setting the printing mechanism, said additional feelers being movable in a direction substantially parallel to the pivotal axes of the levers in order to intersect the planes of movement of said levers in such a manner as to prevent any increase in force applied to the weight value devices on the light and relatively fragile annuli and disc.

3. Printing mechanism, as claimed in claim 2, wherein the explorable devices on said levers are disposed in a single plane whereby the cooperating additional feelers may be made of the same length.

4. Printing mechanism for a weighing machine which includes a rotatable pointer shaft, comprising at least one disc mounted on the pointer shaft and said disc having weight value devices adapted to be explored, at least one substantially balanced pivoted explorable lever having a long arm and a short arm at opposite sides of the pivot, the short arm of said lever having an initial feeler for exploring the weight value devices and the long arm of said lever having explorable devices thereon, additional feeler means adapted to cooperate with the explorable devices for adjusting and setting printing mechanism, and means for mounting said additional feeler means for rectilinear movement into exploring and contacting relationship with the said explorable devices and at substantially right angles thereto whereby to prevent any subfeelers as to be movable at right angles to the planes of movement of said initial feelers whereby to permit exploring of the said explorable devices with substantially no increase in the force applied to the weight value devices on said carrier means.

6. Printing mechanism for a weighing machine which includes a rotatable pointer shaft, comprising at least one disc mounted on the pointer shaft and having weight value devices adapted to be explored, at least one pivoted lever carrying initial feeler means for exploring and lightly contacting the weight value devices on said disc, said lever also having explorable devices thereon, said initial feeler means being movable with the lever and substantially radially of the said disc, and additional feeler means for exploring the said lever borne explorable devices and adapted to adjust and set printing mechanism, said additional feeler means being movable for exploring th said explorable devices in a direction substantially axially parallel to the axis of the said disc whereby to prevent any increase in force applied to the weight value devices on said disc.

7. Printing mechanism for a weighing machine which includes a rotatable pointer shaft and an operating shaft, comprising at least one disc mounted on the pointer shaft and having Weight value devices adapted to be explored, initial feeler means for exploring the Weight value devices on said disc and having explorable devices thereon, means for normally locking said initial feelers out of contact with said disc, additional feelers cooperating with the said explorable devices for adjusting and setting printing mechanism, said additional feelers being movable into exploring and contacting relationship with respect to the said explorable devices with substantially no increase in the force applied to the weight value devices whereby to prevent injury to the disc, and means movable upon operation of said shaft for releasing the locking means to permit said initial feelers to explore the Weight value devices on said disc.

8. Printing mechanism, as claimed in claim 7, wherein the locking means includes a lever having one arm adapted to engage the initial feelers and having the other arm adapted to engage a part of a rack device which is movable upon operation of the printing mechanism to release the lever arm from engagement with the initial feelers.

ARTHUR HAHN. 

